package com.songlanyun.interceptor;

import com.alibaba.fastjson.JSONObject;
import com.songlanyun.common.annotation.RepeatSubmit;
import com.songlanyun.common.utils.R;
import com.songlanyun.common.utils.ServletUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

/**
 * 防止重复提交拦截器
 * 中添加
 *  InterceptorConfiguration implements WebMvcConfigurer
 * @Override
 *     public void addInterceptors
 *        registry.addInterceptor(repeatSubmitInterceptor).addPathPatterns("/**");
 * @author ww
 */
@Component
public abstract class RepeatSubmitInterceptor extends HandlerInterceptorAdapter
{
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception
    {
        if (handler instanceof HandlerMethod)
        {
            HandlerMethod handlerMethod = (HandlerMethod) handler;
            Method method = handlerMethod.getMethod();
            RepeatSubmit annotation = method.getAnnotation(RepeatSubmit.class);

            if (annotation != null)
            {
                if (this.isRepeatSubmit(request, annotation.value()))
                {
                    ServletUtils.renderString(response, JSONObject.toJSONString( R.error("操作频繁，请稍后再试")));
                     return false;
                }
            }
            return true;
        }
        else
        {
            return super.preHandle(request, response, handler);
        }
    }

    /**
     * 验证是否重复提交由子类实现具体的防重复提交的规则
     *
     * @param request
     * @return
     * @throws Exception
     */
    public abstract boolean isRepeatSubmit(HttpServletRequest request,String limitSec);
}
